DE102015224916A1 - Treatment plant and method for treating workpieces - Google Patents

Abstract

In order to provide a treatment plant which is simple in construction and enables energy-efficient work piece treatment, it is proposed that the treatment plant include:
a treatment room comprising a plurality of treatment room sections each associated with one of a plurality of separate circulating air modules of the treatment facility;
a heating system which comprises a self-contained heating gas guide, wherein a plurality of circulating air modules are coupled to the Heizgasführung, in particular for heating the guided through the treatment space sections gas.

Description

The present invention relates to a treatment plant and a process for treating workpieces. In particular, a treatment plant is used to dry coated vehicle bodies. The method for treating workpieces is therefore in particular a method for drying coated vehicle bodies.

Treatment plants and treatment methods are in particular from EP 1 998 129 B1 , of the US 2006/0068094 A1 , of the EP 1 302 737 A2 and the WO 02/073109 A1 known.

The present invention has for its object to provide a treatment plant, which is simple in construction and allows energy-efficient workpiece treatment.

This object is achieved according to the invention in that the treatment installation for treating workpieces comprises the following:
a treatment room comprising a plurality of treatment room sections each associated with one of a plurality of separate circulating air modules of the treatment facility;
a heating system, which comprises a self-contained Heizgasführung, wherein a plurality of circulating air modules are coupled to the Heizgasführung, in particular for heating the guided through the treatment space sections gas.

Characterized in that the treatment plant according to the invention comprises a heating system with a self-contained Heizgasführung, which is coupled to the circulating air modules, the gas to be supplied to the treatment chamber sections can be heated easily and efficiently. The treatment plant can thereby be operated in a particularly energy-efficient manner.

The Heizgasführung is preferably formed annularly closed, so that at least a partial gas flow of a guided in the Heizgasführung heating gas flow repeatedly flows through the Heizgasführung.

The heating gas is preferably raw gas and / or clean gas which is suitable and / or intended for use in the treatment space, that is to say for the flow through the treatment space.

The heating gas preferably has a temperature which is higher than the gas flow in the circulating air modules and / or treatment chamber sections, at least immediately upstream of the treatment space sections.

Preferably, the heating gas is not exhaust gas of a heating device of the heating system, in particular no combustion exhaust gas.

A "self-contained Heizgasführung" is in particular a heating gas to understand in which at least a portion of a Heizgasstroms is performed in a circuit. Independently of this, a continuous or phase-wise supply of fresh gas to the heating gas flow and / or removal of heating gas from the heating gas flow can preferably also be provided in the case of a self-contained heating gas duct.

It may be favorable if a feed of fresh gas and a discharge of heating gas, that is to say an exchange of heating gas, are preferably dimensioned so that in a single pass of the Heizgasstroms by the Heizgasführung at least 40%, preferably at least about 50%, in particular at least about 80%, for example, at least about 90%, of the past at a certain point of the Heizgasführung stream of heating gas after complete passage again reach this point.

The supply of fresh gas and / or the discharge of heating gas from the heating gas flow is preferably carried out exclusively in the treatment space sections and / or the recirculation modules of the treatment plant.

However, it may also be provided that the heating system is associated with a fresh gas supply and / or exhaust gas discharge, by means of which outside of the treatment room sections and / or outside the recirculation modules supplied fresh gas or heating gas can be removed from the Heizgasstrom.

The circulating air modules and / or the treatment chamber sections are preferably part of the heating gas guide.

In particular, the heating gas can preferably be passed through the treatment chamber sections at least partially several times before it (again) flows through the part of the heating gas duct located outside the circulating air modules and / or outside the treatment chamber sections.

In one embodiment of the invention, it may be provided that the heating gas guide comprises a recirculating air guide, which is formed in sections by a plurality of recirculating air modules and / or treatment space sections arranged in parallel.

In the circulating air modules and / or treatment chamber sections, a gas flow in a circulating air circuit is preferably feasible, which Heating gas from the Heizgasführung can be fed. Preferably, a partial gas flow of the circulated gas flow of each circulating air module and / or treatment chamber section from the circulating air module and / or the treatment chamber section can be discharged, guided by the Heizgasführung in a closed circuit and finally fed as part of the Heizgasstroms again one or more circulating air modules and / or treatment room sections ,

Preferably, the treatment plant comprises a conveying device, by means of which the workpieces can be supplied to the treatment space, can be discharged from the treatment space and / or can be conveyed through the treatment space in a conveying direction of the conveying device.

The treatment space sections and / or the recirculation modules are preferably arranged successively in the conveying direction.

It may be favorable if the circulating air modules are independent recirculation modules.

A circulating air module, in particular each circulating air module, preferably comprises the following:
a gas supply for supplying gas to the treatment space portion; and or
a gas discharge for discharging gas from the treatment space portion; and or
a blower device for driving a (recirculation) gas flow; and / or a separation device for separating impurities from the (circulating) gas stream; and or
a distribution device for distributing the (recirculation) gas flow to be supplied to the treatment space section to a plurality of inlet ports of the gas supply; and or
a collecting device, by means of which the (recirculation) gas flow discharged through a plurality of outlet openings (return openings) of the gas discharge from the treatment space can be brought together.

Each circulating air module preferably forms, together with the associated treatment space section, a, in particular complete, section of the treatment plant.

In this specification and the appended claims, the term "circulating air" is not necessarily set to the gas "air". Rather, the term "circulating air" preferably denotes a gas circulated in a cycle (circulating air circulation), which in particular is treated and / or reused several times.

Likewise, the terms "supply air", "supply air", "exhaust air" and "exhaust air flow" are not necessarily set to the gas "air", but rather generally designate a recirculation circuit supplied gas (supply air, supply air) or one from the recirculation circuit discharged gas (exhaust air, exhaust air flow).

In one embodiment of the invention can be provided that the heating system comprises a heater and a heat exchanger, by means of which heat generated in the heater is transferable to a guided in the Heizgasführung heating gas.

The heat exchanger is arranged in particular in an exhaust gas line of the heating device in order to be able to use heat contained in the exhaust gas of the heating device for heating the heating gas.

It can be advantageous if the treatment plant comprises a different and / or independent fresh gas supply from the heating system, by means of which fresh gas can be supplied to the treatment space.

The fresh gas is preferably fed independently of a flow of heating gas to the gas flow guided in the circulating air modules and / or treatment space sections and thus to the treatment space.

Furthermore, it can be provided that the fresh gas flow is at least partially used as a lock gas flow and is supplied in this way to the treatment space.

It may be advantageous if the treatment plant comprises a fresh gas feed, by means of which fresh gas can be supplied to a guided in the Heizgasführung heating gas flow.

The fresh gas supply is preferably coupled to a heat exchanger to the exhaust line of the heater, in particular to transfer heat from the exhaust gas of the heater to the fresh gas to be supplied by means of the fresh gas supply.

The heat exchanger for heating the fresh gas is preferably one of the heat exchanger for heating the heating gas different heat exchanger.

Alternatively, it can be provided that serve different portions of a common heat exchanger on the one hand for heating the fresh gas and on the other hand for heating the heating gas. The fresh gas supply and the Heizgasführung then have in particular a common heat exchanger. In particular, a cold side of the heat exchanger is then preferably divided into a plurality of segments. In particular, it is possible to provide a plurality of segments which can be flowed through independently of each other and separated from each other in a fluid-efficient manner.

The treatment plant preferably comprises one or more locks, which are designed in particular as fresh gas locks and through which fresh gas flows or can be flowed through.

Alternatively or additionally, it can be provided that the treatment plant comprises one or more circulating air locks, which are traversed by circulating air, that is, a circulated gas flow in a circuit or can be flowed through. For this purpose, it can be provided, in particular, that each recirculation air lock is assigned to a circulating air module.

In particular, when the treatment plant comprises recirculating air locks, it can be provided that a fresh gas stream is added directly to the heating gas stream or is admixed. In this way, a separate fresh gas line for supplying fresh gas to the treatment room can be dispensed with.

It may be advantageous for the heating gas duct to comprise a central heating gas duct in which heating gas can be guided or routed and by means of which heating gas can be supplied to the heating and cooling chamber from the plurality of circulating air modules and / or treatment chamber sections, the heating gas being conveyed directly or indirectly via the circulating air modules into the respective treatment chamber sections can be introduced.

The heating gas guide thus preferably forms a supply air duct for supplying supply air to the circulating air circuits in the treatment space sections.

Furthermore, it may be provided that the heating gas guide comprises a central heating gas line, in which heating gas is guided or can be guided and by means of which gas can be discharged from the circulating air modules and / or from the treatment space sections.

The Heizgasführung thus preferably forms an exhaust duct for the removal of exhaust air from the guided in the circulating air in the circulation gas streams.

It may be favorable if the heating gas guide comprises a central heating gas line, by means of which a heating gas can be guided annularly from a heat exchanger for heating the heating gas to the several circulating air modules and / or treatment space sections and back again to the heat exchanger.

Alternatively or additionally, it may be provided that the Heizgasführung comprises a central heating gas, by means of which gas, which serves in particular as a heating gas, from one or more Umluftmodulen and / or treatment room sections dissipatable and for heating a heat exchanger fed and then back to the one or the several Umluftmodulen and / or treatment room sections is feasible.

The guided in the Heizgasführung heating gas is preferably driven by means of exactly one fan or by means of several fans.

It can be provided that the heating gas duct comprises a plurality of branches or branches for distributing a heating gas flow guided in the heating gas duct to the circulating air modules and / or treatment chamber sections.

In particular, it can be provided that the heating gas guide comprises a main supply line extending along the circulating air modules and / or treatment space sections, from which parts of the heating gas stream can be branched off and fed to the respective circulating air modules and / or treatment space sections.

By means of the branches or branches of the heating gas stream is preferably divisible to ultimately obtain a plurality of supply air streams for supplying the heating gas to the circulating air modules and / or treatment space sections.

It may be advantageous if the heating gas guide has a main branch, by means of which a total heating gas stream can be divided into a first partial heating gas stream and a second partial heating gas stream, the first partial heating gas stream having a first circulating air module or first to nth circulating air module and / or with respect to a conveying direction of a conveying device of the treatment plant. or first treatment room section or first to n-th treatment room section can be fed and wherein the second partial heating gas stream is preferably divisible to all other circulating air modules and / or treatment space sections.

The first circulating air module is preferably a circulating air module assigned to a treatment chamber section. However, it can also be provided that this first circulating air module is a circulating air module assigned to a circulating airlock.

It may be favorable if the heating gas guide comprises a plurality of mergings for merging a plurality of gas flows discharged from the circulating air modules and / or treatment chamber sections.

In particular, thereby preferably exhaust air streams from the recirculation modules and / or treatment room sections can be brought together and reheated as Heizgasgesamtstrom again and finally again the recirculation modules and / or treatment room sections fed.

It may be provided that the heating gas guide has a main junction, by means of which an exhaust gas flow of a relative to a conveying direction of the conveying device of the treatment plant first circulating air module or first to nth recirculation module and / or first treatment room section or first to nth treatment space section with an already merged exhaust gas flow all further circulating air modules and / or treatment room sections can be brought together.

The use of a main branch and / or a main junction can in particular serve to reduce channel cross sections of a main supply line and / or a main discharge line of the heating gas line, in particular in order not to have to pass the entire heating gas flow in a single flow direction through the main supply line and / or the main discharge line.

It can be provided that each circulating air module and / or each treatment chamber section comprises an inlet valve and / or an outlet valve, by means of which a volume flow of the Umluftmodul and / or the treatment chamber section to be supplied Heizgasstroms and / or a flow of a from the circulating air module and / or Treatment room section discharged gas flow controllable and / or regulated.

Preferably, a supply air flow and / or an exhaust air flow of the recirculated air flow guided in the respective circulating air module and / or treatment space section can thereby be controlled and / or regulated.

The treatment plant preferably comprises a control device by means of which the volumetric flow of the heating gas flow to be supplied to the circulating air module and / or treatment space section and / or the volumetric flow of the gas flow discharged from the circulating air module and / or from the treatment space section can be controlled and / or regulated.

Preferably, by means of the control device, by controlling the volume flows, so much heating gas can always be supplied to the respective circulating air module and / or treatment chamber section that a desired temperature of the recirculating air flow guided in the respective circulating air module and / or treatment chamber section is substantially constant.

The control device is preferably designed and set up such that the described functions can be carried out and / or that the described parameters are maintained, in particular kept at least approximately constant.

It may be favorable if the treatment system comprises a control device by means of which an at least approximately constant volume flow of the heating gas flow guided in the heating gas flow can be maintained. In particular, it may be provided that a fan driving the heating gas flow of the heating gas guide is controlled and / or regulated, for example by varying a drive power.

The fan (or fan) for driving the Heizgasstroms preferably comprises a frequency converter, via which the control and / or regulation can take place.

Preferably, by controlling and / or regulating the blower of the heating gas control, fluctuations in the total energy demand of the treatment plant, in particular fluctuations in the heating demand, can be compensated.

Alternatively or additionally, a desired value and / or an actual value for a temperature of the heating gas flow can be adapted, in particular if a low volume flow of the heating gas flow has already been set with low heating demand, for example the volume flow has been reduced to a minimum.

Furthermore, it can be provided that initially the temperature of the Heizgasstroms is reduced with reduced heating demand. Upon reaching a predetermined lower limit of the temperature of the Heizgasstroms can then be further provided that the flow rate is reduced by appropriate control and / or regulation of the blower.

It can be provided that the treatment plant comprises a control device, by means of which an at least approximately constant temperature of the guided in the Heizgasführung heating gas flow is maintained. In particular, it may be provided that a bypass volume flow past a heat exchanger for heating the heating gas flow is influenced, in particular selectively varied. For example, a ratio of the volume flow performed by the heat exchanger for heating the Heizgasstroms be varied to the bypass volume flow to achieve the desired temperature of the guided in the Heizgasführung Heizgasstrom.

In one embodiment of the invention, it can be provided that the heating gas guide comprises a bypass line for bypassing all circulating air modules and / or treatment space sections. In this way, a reserve of Heizgasstroms can be provided, in particular to prevent unwanted undersupply of individual air circulation modules and / or treatment room sections.

By means of the bypass line, in particular, an oversupply of heating gas in the main supply line of the heating gas duct can be maintained.

Preferably, the main supply line opens at a downstream end thereof and / or at a rear end thereof with respect to the conveying direction into the bypass line.

The bypass line preferably opens at an upstream end of the main discharge line and / or at a rear end thereof with respect to the conveying direction into the main discharge line.

The present invention further relates to a method for treating workpieces.

The invention is in this respect the task of providing a method by which workpieces are easy and energy-efficient treatable.

This object is achieved according to the invention by a method which comprises:
Flowing through a plurality of treatment room sections of a treatment room of a treatment plant with a plurality of gas streams guided in separate circuits;
Heating the gas streams by means of a Heizgasstroms, which is guided in a self-contained Heizgasführung a heating system of the treatment plant.

The method according to the invention preferably has one or more of the features and / or advantages described in connection with the treatment plant.

Furthermore, the treatment facility preferably has one or more features and / or advantages which are described in connection with the method.

In the method according to the invention, it can preferably be provided that, for heating the several gas streams guided in the separate circulations, a partial stream of each of these gas streams is removed from the respective gas stream and replaced by a partial stream of the heating gas stream.

By a "valve" is meant in this specification and the appended claims in particular any kind of closure element or opening element for influencing a flow rate in a conduit. In particular, a valve may be a flap.

It may be favorable if the circulating air modules each comprise or form a recirculating air duct. However, it can also be provided that a circulating air module is only a part of a circulating air duct, namely that part which serves for driving the gas flow guided in the recirculating air duct.

The further part is then in particular the associated treatment room section.

Preferably, each circulating air module comprises at least one fan and an intake space arranged immediately upstream of the fan.

In the suction chamber preferably opens a feed channel, via which heating gas from a Heizgasleitung the Heizgasführung, in particular a Hauptzuführleitung, is fed to the circulating air module. In this way, the heating gas is preferably sucked by means of the at least one fan of the circulating air module from the Heizgasleitung.

A main supply line for distributing the hot gas to the circulating air modules preferably extends parallel to a conveying direction of a conveying device of the treatment plant and / or over at least approximately an entire length of the treatment space.

The main supply line is preferably arranged outside of a housing whose interior forms the treatment space.

Furthermore, it may be provided that the heating system comprises a main discharge line which extends parallel to the conveying direction of a conveying device of the treatment plant and / or over at least approximately an entire length of the treatment space.

The main discharge line preferably serves to discharge gas streams discharged from the circulating air modules and / or treatment chamber sections.

The main discharge line is preferably arranged within a housing surrounding the treatment space, in particular by division or separation of part of the interior of the housing.

Preferably, at least one exhaust valve of each recirculation module or each Treatment chamber portion for discharging a gas stream from the guided in the circulating air module and / or the treatment space section gas stream arranged in a partition, which divides an inner space of the housing into the treatment space and the Hauptabführleitung.

Preferably, in one embodiment of the treatment plant, a transverse conveyance of the workpieces, in particular of the vehicle bodies, is provided. In this case, a vehicle longitudinal axis of the vehicle bodies is preferably aligned horizontally and perpendicular to the conveying direction of the conveying device.

It may be favorable if a main flow direction of the gas flow guided through a treatment space section is at least approximately parallel to a vehicle longitudinal axis of the vehicle body conveyed through. In particular, it can be provided that the main flow direction is aligned substantially parallel to the vehicle longitudinal axis such that the vehicle body is flowed around from front to rear with the gas flow. However, it can also be provided that the main flow direction is oriented so that the vehicle body is flowed around from behind to the front with the gas flow.

It can also be provided that in the treatment plant, a longitudinal promotion is provided, in which the vehicle longitudinal axis is aligned parallel to the conveying direction of the conveyor.

It may be favorable if the treatment plant comprises a main treatment plant and a pretreatment plant.

Preferably, the main treatment plant and the pretreatment plant each comprise a separate heating gas guide.

Preferably, a treatment plant, which comprises both a main treatment plant and a pretreatment plant, comprises two mutually independent, self-contained heating gas ducts, which are in particular thermally coupled to a common heating device.

The main treatment plant preferably comprises a heat exchanger for the thermal coupling of the main treatment plant with an exhaust gas outlet of the heating device.

Furthermore, preferably, the pretreatment plant comprises a heat exchanger for the thermal coupling of the pretreatment plant with the exhaust gas discharge of the heater.

It may be favorable if the fresh gas supply for supplying fresh gas to a treatment room of the main treatment plant and / or to a treatment room of the pretreatment plant comprises a heat exchanger, by means of which the fresh gas supply is thermally coupled to the exhaust gas outlet of the heating device.

The one or more heat exchangers are preferably arranged on or in the exhaust gas outlet.

The heat exchanger of the fresh gas supply is preferably arranged with respect to a flow direction of the exhaust gas in the exhaust gas outlet downstream or upstream of a heat exchanger of the main treatment plant and / or upstream or downstream of a heat exchanger of the pretreatment system.

Preferably, a heat exchanger of the main treatment plant is arranged with respect to a flow direction of the exhaust gas in the exhaust gas outlet upstream or downstream of a heat exchanger of the pretreatment plant.

In a preferred embodiment, it is provided that the heat exchangers are coupled to the exhaust gas discharge of the heater, that the exhaust gas discharged from the heater is first supplied to the heat exchanger of the main treatment plant, then the heat exchanger of the pretreatment plant and then the heat exchanger of the fresh gas supply or can be fed.

An exhaust gas from the pretreatment plant and an exhaust gas from the main treatment plant can preferably be brought together and supplied to the heating device as a common exhaust gas stream.

Further preferred features and / or advantages of the invention are the subject of the following description and the drawings of exemplary embodiments.

In the drawings show:

1 a schematic representation of a first embodiment of a treatment plant in which a self-contained Heizgasführung and an independent fresh gas supply are provided;

2 one of the 1 corresponding schematic representation of a second embodiment of a treatment plant, in which an optimized flow guidance of the heating gas is provided;

3 one of the 1 corresponding schematic representation of a third embodiment of a treatment plant in which the fresh gas supply opens into the Heizgasführung;

4 a schematic perspective view of a recirculation module of a treatment plant including a treatment space portion of a treatment room of the treatment plant;

5 a schematic side view of the treatment room section 4 ;

6 an enlarged view of a portion of the recirculation module 4 ;

7 a schematic horizontal section through an underbody structure of the circulating air module and the treatment space section 4 ;

8th a schematic vertical section through the circulating air module and the treatment space section 4 along the line 8-8 in 7 ;

9 a schematic vertical section through the circulating air module and the treatment space section 4 along the line 9-9 in 7 ;

10 a schematic vertical section through the circulating air module and the treatment space section 4 along the line 10-10 in 7 ; and

11 one of the 1 corresponding schematic representation of a fourth embodiment of a treatment plant, in which a pre-treatment plant is provided.

Identical or functionally equivalent elements are provided with the same reference numerals in all figures.

An in 1 schematically illustrated first embodiment of a whole with 100 designated treatment plant is used to treat workpieces 102 ,

The treatment plant 100 is for example a drying plant 104 for drying workpieces 102 ,

The workpieces 102 are for example vehicle bodies 106 ,

The treatment plant 100 is preferably used to dry previously painted or otherwise treated vehicle bodies 106 ,

The workpieces 102 are by means of a conveyor 108 the treatment plant 100 along a conveying direction 110 through a treatment room 112 the treatment plant 100 hindurchförderbar.

The treatment room 112 comprises a plurality, for example at least four, in particular at least six, preferably exactly seven, treatment room sections 114 or is through these treatment room sections 114 educated.

Each treatment room section 114 is preferably a separate recirculation module 116 assigned.

By means of each recirculation module 116 is preferably a gas stream in a circuit, in particular a recirculating air duct 118 , feasible and through the respective treatment room section 114 passed. Preferably, in each case form a circulating air module 116 and one treatment room section each 114 a recirculation system 118 ,

Preferably, each circulating air module comprises 116 one or more fans 120 for driving the recycled gas stream.

Each recirculation module 116 and / or each treatment room section 114 further preferably comprises an inlet valve 122 and an exhaust valve 124 ,

By means of the inlet valve 122 can preferably serve as a supply air flow gas stream to that in the circulating air 118 be added guided gas stream.

By means of the exhaust valve 124 may preferably be a part of the circulating air 118 led gas stream are discharged.

By means of the inlet valve 122 and the exhaust valve 124 can thus exchange the in the recirculation 118 guided gas flow are performed. This replacement of the in the recirculation 118 Guided gas flow is used in particular to certain parameters of the circulating air 118 controlled gas flow and / or to regulate. In particular, preferably, a temperature of the circulating air 118 guided gas flow thereby controlled and / or regulated.

In particular, it can be provided that in the circulating air 118 Guided gas stream is heated by supplying fuel gas. This heat input then serves in turn to the workpiece to be treated 102 to heat, especially as a vehicle body 106 trained workpiece 102 to dry.

The one of each air circulation 118 supplied gas is preferably a heating gas, which by means of a heating system 126 the treatment plant 100 is available.

The heating system 126 preferably comprises a heating device 128 , which, for example, as a thermal exhaust gas purification device 130 is trained.

By means of the heater 128 is preferably a hot exhaust gas generated, which via an exhaust gas discharge 132 from the heater 128 is deductible.

Preferably, the heating system comprises 126 Furthermore, at least one heat exchanger 134 , which thermally with the exhaust pipe 132 is coupled to use the heat of the exhaust gas to heat another medium.

This further medium is for example a heating gas, which in a closed Heizgasführung 136 is guided or manageable.

The heating gas guide 136 is in particular a recirculation, in which at least a majority of the fuel gas guided therein is guided in a circuit or feasible.

The heating gas guide 136 preferably comprises a heating gas line 138 and one or more fans 120 for driving in the heating gas line 138 guided fuel gas.

By means of a heat exchanger 134 the heating system 126 is preferably the exhaust gas discharge 132 the heater 128 thermally with the heating gas line 138 coupled.

The heating gas line 138 preferably comprises a feed section 140 , which the heat exchanger 134 with the recirculation modules 116 and / or the treatment room sections 114 combines.

About the feeding section 140 the heating gas line 138 is in particular heated fuel gas to the circulating air ducts 118 and thus to the treatment room sections 114 fed.

The heating gas line 138 also includes an exhaust section 142 , over which from the circulating air ducts 118 discharged gas can be discharged and re-heating the same the heat exchanger 134 can be fed.

The feeding section 140 the heating gas line 138 preferably comprises several branches 144 or branches 146 to a total Heizgasstrom on the individual air circulation modules 116 and / or treatment room sections 114 to distribute.

The discharge section 142 preferably comprises several merges 148 to the individual from the recirculating air ducts 118 merge discharged (partial) gas streams and as a common gas stream again the heat exchanger 134 to be able to supply.

The heating gas guide 136 preferably further comprises a bypass line 150 , by means of which a partial gas flow of the over the feed section 140 the heating gas line 138 the circulating air ducts 118 supplied Heizgasgesamtstroms to all air circulation modules 116 and / or treatment room sections 114 passable and directly to the discharge section 142 can be fed.

By using such a bypass line 150 may preferably be an oversupply of heating gas before the circulating air ducts 118 be provided to even with fluctuating Heizgasbedarf in the circulating air ducts 118 always have a sufficient amount of fuel gas available.

A volume flow of the over the bypass line 150 at the circulating air ducts 118 passing Heizgasstroms is preferably by means of a bypass valve 152 controllable and / or controllable.

The heating gas guide 136 preferably comprises one or more control devices 154 for controlling and / or regulating the fans 120 and / or the intake valves 122 and / or the exhaust valves 124 and / or the bypass valve 152 the bypass line 150 ,

By means of the one or more control devices 154 is thus in particular a distribution of Heizgasstroms on the circulating air ducts 118 controllable and / or controllable.

Further, by means of the one or more control devices 154 a total volume flow and / or a temperature of the Heizgasstroms controllable and / or regulated.

The heating gas guide 136 may also have a bypass line 150 in the area of the heat exchanger 134 include. By means of this bypass line 150 and by means of one of these bypass line 150 associated bypass valve 152 is preferably controllable and / or regulated, which partial volume flow of Heizgasgesamtstroms for heating the same by the heat exchanger 134 passed or passed by this. In particular, this can result in a constant temperature of the heating gas flow downstream of the heat exchanger 134 and the bypass line 150 and or upstream of the recirculating air ducts 118 controlled and / or regulated.

In one embodiment of the treatment plant 100 can be provided that the heating gas line 138 , in particular the feed section 140 the heating gas line 138 , a main supply line 156 includes.

This main feed line 156 preferably runs outside the treatment room 112 parallel to the conveying direction 110 , Preferably, the main supply line extends 156 at least approximately over an entire length of the treatment room 112 to all circulating air ducts 118 be able to supply with heating gas.

The heating gas line 138 , in particular the discharge section 142 the heating gas line 138 , preferably comprises a main discharge line 158 ,

The main discharge line 158 is preferably outside the treatment room 112 arranged or integrated into this.

In particular, it can be provided that the main discharge line 158 parallel to the conveying direction 110 and / or at least approximately over an entire length of the treatment room 112 extends. As a result, preferably all of the recirculating air ducts 118 discharged (partial) gas streams are discharged.

The bypass line 150 to bypass all recirculating air ducts 118 is preferably at one with respect to the conveying direction 110 the conveyor 108 rear end of the main supply line 156 and / or the main discharge line 158 arranged.

The treatment plant 100 further comprises a fresh gas supply 160 for supplying fresh gas to the treatment room 112 ,

The fresh gas supply 160 preferably comprises a fresh gas line 162 and a fan 120 for driving a fresh gas flow in the fresh gas line 162 ,

Furthermore, the fresh gas supply comprises 160 preferably a heat exchanger 134 , by means of which the fresh gas line 162 and the exhaust gas discharge 132 the heater 128 thermally coupled together. In particular, this is the case via the fresh gas supply 160 supplied fresh gas before it is supplied to the treatment room 112 heatable.

The fresh gas line 162 preferably opens in the region of an inlet section 164 in which the workpieces 102 in the treatment room 112 be guided in, and / or in the region of an exit section 166 in which the workpieces 102 from the treatment room 112 be discharged into the treatment room 112 ,

In particular, they are in the area of the inlet section 164 an inlet lock 168 and / or in the region of the exit section 166 an outlet lock 170 intended. Furthermore, one or more intermediate locks can be provided.

The about the fresh gas supply 160 supplied fresh gas serves in particular as a lock gas with which is avoidable that in the circulating air ducts 118 guided gas through the inlet section 164 and / or the exit section 166 to the outside to an environment of the treatment plant 100 is delivered.

The volume flow of the fresh gas stream is preferably selected such that, starting from the inlet section 164 and / or the exit section 166 a longitudinal or opposite to the conveying direction 110 and thus transversely to those in the circulating air ducts 118 Guided gas flows flowing cross-flow results. This leads in particular to a loading of the in the treatment room 112 guided gas stream with impurities and / or other substances, such as solvent vapors, etc., to the center of the treatment room 112 increased.

An upstream end of an exhaust discharge 172 the treatment plant 100 is therefore preferably substantially centered with respect to the conveying direction 110 at the treatment room 112 intended.

About the exhaust removal 172 is in particular an exhaust gas flow from the treatment room 112 drained and preferably directly to the heater 128 fed.

In particular, if that from the treatment room 112 discharged exhaust gas is solvent-containing, by means of the heater 128 a purification of the exhaust gas using contained in the exhaust gas and / or released during combustion energy done.

The treatment plant described above 100 works as follows:
For heating and / or drying the workpieces 102 These are by means of the conveyor 108 through the inlet lock 168 in the treatment room 112 promoted. In the treatment room 112 go through the workpieces 102 successively the treatment room sections 114 ,

Single, multiple or all treatment room sections 114 be with one in one Circulation-guided gas flow flows through, which is opposite to the temperature of the workpiece 102 has elevated temperature, so that the workpiece 102 heated due to the flow around and / or onflow with the gas stream or maintains a predetermined temperature.

The initially relatively cold workpiece 102 takes in particular in a respect to the conveying direction 110 first treatment room section 114 the largest amount of heat, so that the recirculation module 116 and / or the circulating air guide 118 this first treatment room section 114 must provide the largest heat output. The subsequent treatment room sections 114 preferably provide continuously lower heat outputs.

The respective heating power is provided by heating gas from the heating system 126 to the respective circulating air module 116 and / or the respective treatment room section 114 is supplied.

This heating gas has opposite to that in the circulating air 118 guided gas flow to an elevated temperature, to ultimately the entire in the recirculation 118 Guided gas flow and thus the workpiece 102 to heat.

The heating gas is provided by this by means of a heat exchanger 134 using hot exhaust from the heater 128 is heated.

For example, it can be provided here that the heating gas is heated to a temperature of at least approximately 200 ° C., preferably at least approximately 250 ° C., for example approximately 270 ° C.

To compensate for each of the circulating air ducts 118 supplied Heizgasvolumenstroms is preferably a corresponding partial gas flow in the circulating air 118 Guided gas flow from the recirculation 118 dissipated.

These discharged gas streams from all circulating air ducts 118 are merged and re-heating and thus to provide heated fuel gas to the heat exchanger 134 fed.

Especially if the workpieces 102 When drying the same health-relevant substances release, an excessive concentration of the same and an undesirable release to the environment must be avoided. This is the treatment room 112 via the fresh gas supply 160 Fresh gas is supplied and it is loaded with the health-relevant substances gas via the exhaust gas discharge 172 dissipated.

The discharged exhaust gas is then in the heater 128 cleaned, in particular by burning the substances contained therein.

Exhaust gas from the heater 128 is then about the exhaust gas discharge 132 dissipated. The heat contained in this exhaust gas is used to that via the fresh gas supply 160 supplied fresh gas and / or in the Heizgasführung 136 heated fuel gas to heat.

An in 2 illustrated second embodiment of a treatment plant 100 is different from the one in 1 illustrated first embodiment essentially in that the Heizgasleitung 138 a main branch 180 and / or a main merger 182 includes.

The main branch 180 is preferably used to the heated total heating gas flow already in the supply to the main supply 156 on the one hand with respect to the conveying direction 110 first air circulation 118 and on the other hand on all other air circulation ducts 118 to distribute. As a result, in particular, a flow cross-section of the main supply line 156 be minimized, since not the entire heating gas flow for all circulating air ducts 118 for example, along the conveying direction 110 through the main supply line 156 must be led. Rather, a Heizgasteilvolumenstrom for the respect to the conveying direction 110 first air circulation 118 , which in comparison with the other circulating air ducts 118 has to provide the largest heat output, branched off and counter to the conveying direction 110 to this air circulation 118 be supplied.

The main reunification 182 is preferably used to merge a from the respect to the conveying direction 110 first air circulation 118 discharged partial gas flow with the partial gas streams, which from all other circulating air ducts 118 were removed. As a result, preferably a line cross section of the main discharge line 158 be minimized.

Incidentally, the in 2 illustrated second embodiment of the treatment plant 100 in terms of structure and function with the in 1 illustrated first embodiment, so that reference is made to the above description in this respect.

An in 3 illustrated third embodiment of a treatment plant 100 is different from the one in 2 illustrated second embodiment essentially in that the Fresh gas supply 160 directly into the heating gas duct 136 empties.

That the treatment room 112 fresh gas to be supplied is at the in 3 illustrated third embodiment of the treatment plant 100 consequently via the heating gas line 138 , in particular the feeding section 140 the heating gas line 138 , to the circulating air ducts 118 and thus to the respective treatment room sections 114 fed.

The inlet lock 168 and the outlet lock 170 are preferably perfused with circulating air. For this purpose, preferably separate recirculation modules 116 or the recirculation modules 116 the respective adjacent treatment room sections 114 the inlet lock 168 or the outlet lock 170 assigned.

Incidentally, the in 3 illustrated third embodiment in terms of structure and function with in 2 illustrated second embodiment, so that reference is made to the above description in this respect.

In all the described embodiments may also be provided that in the inlet section 164 and / or in the exit section 166 additional, in particular unconditioned, fresh air or other fresh gas is supplied, whereby preferably an undesirable outflow of gas from the treatment chamber 112 is avoided.

One in the 4 to 10 illustrated embodiment of a recirculation 118 is an example of a circulating air duct 118 a treatment plant 100 according to the 1 . 2 . 3 or 11 ,

The recirculation module 116 the circulating air duct 118 is a treatment room section 114 the circulating air duct 118 assigned, so that this treatment room section 114 can be flowed through with a guided in a recirculating air gas flow.

As in particular the 4 . 6 and 8th to 10 it can be seen, is the recirculation module 116 to a main supply line 156 a treatment plant 100 coupled to the recirculation module 116 and / or by the circulating air module 116 and / or the treatment room section 114 formed air circulation 118 be able to supply with heating gas.

The recirculation module 116 includes one or more fans 120 for driving the gas flow in the circulating air duct 118 ,

The recirculation system 118 preferably includes the one or more fans 120 , a pressure chamber 190 , the treatment room section 114 , a return line 192 and / or a suction space 194 ,

The pressure chamber 190 in particular, immediately downstream of the one or more fans 120 arranged and preferably serves the equalization of the treatment room section 114 to be supplied gas stream and the distribution of the gas stream to a plurality of feed openings 196 for supplying the gas flow to the treatment space section 114 ,

The over the feed openings 196 in the treatment room section 114 introduced gas stream is preferably partially via one or more return ports 198 from the treatment room section 114 dischargeable and via the return line 192 the suction chamber 194 fed.

Another part of the over the feed openings 196 the treatment room section 114 supplied gas stream is preferably via discharge openings 200 from the circulating air duct 118 and from the treatment room section 114 dischargeable as well as the main discharge line 158 fed.

The feed openings 196 , the return openings 198 and / or the discharge openings 200 are preferably arranged such that preferably at least a majority of the through the treatment space section 114 guided gas flow on one side of the workpiece 102 is supplied or can be fed and on one of this side opposite another side of the workpiece 102 from the treatment room section 114 is dischargeable or is discharged. This preferably results in an optimized flow through the treatment chamber section 114 as well as an optimized heating of the workpiece 102 ,

In particular 5 it can be seen that, in addition to the preferably in a side wall of the treatment space section 114 arranged feed openings 196 further feed openings 196 are provided, which in a the treatment room section 114 bottom bordering 202 are arranged. The workpiece 102 is by means of these additional feed openings 196 preferably streamable from below. As in particular the 4 . 7 and 8th it can be seen, the supply of gas flow to those in the ground 202 arranged feed openings 196 from the pressure chamber 190 over one or more below the ground 202 or in the ground 202 running floor channels 204 ,

For example, there are two such floor channels 204 provided to the gas flow to the additional feed openings 196 supply.

These two floor channels 204 are preferably on both sides of the return line 192 arranged (see in particular 7 ).

The suction space 194 is preferably immediately upstream of the one or more fans 120 arranged so that in the suction space 194 located gas over the one or more fans 120 can be sucked.

The return line 192 flows into the intake chamber 194 , Furthermore, it can be provided that the suction 194 through a downstream end of the return line 192 is formed.

About the intake chamber 194 Preferably, the supply of heating gas from the main supply line 156 in the recirculation system 118 ,

For this purpose, a feed channel 206 provided, which is the main supply line 156 with the suction chamber 194 Fluideffective connects.

In the feed channel 206 or at one or both ends thereof is preferably a valve, in particular the inlet valve 122 , arranged (in the 4 to 10 not shown). By means of the valve is preferably the amount (the volume flow) of the circulating air guide 118 supplied fuel gas controllable and / or regulated.

Due to the fact that the feed channel 206 preferably in the suction 194 can, by means of the one or more fans 120 simple and energy efficient heating gas from the main supply line 156 to the in the recirculation 118 be added mixed gas stream. By then flowing through the one or more fans 120 as well as the pressure chamber 190 is also preferably a uniform mixing of the supplied fuel gas and the circulating air 118 guaranteed residual gas flow ensured.

The the treatment room section 114 supplied gas stream is thus preferably in spite of the admixing of the heating gas, a homogeneous gas stream with a preferably constant temperature.

In a (not shown) further embodiment of a treatment plant 100 and / or a recirculation system 118 can also be provided that heating gas from the main supply 156 directly into a floor duct 204 can be supplied to ultimately by means of the additional feed openings 196 individual areas of the treatment room section 114 and / or the workpiece 102 to heat more than the other areas.

In particular 5 it can be seen, is the main discharge line 158 preferably in a treatment room section 114 surrounding housing 208 integrated.

The housing 208 is, for example, substantially cuboid. The main discharge line 158 is for example by separation of a part of the cuboid interior of the housing 208 educated. In particular, it may be provided that an upper corner region of the interior of the housing 208 for the production of the main discharge line 158 from the treatment room section 114 is divided.

The main supply line 156 however, is preferably outside the housing 208 arranged. However, it can also be provided that the main feed line 156 likewise by division of an area of the interior of the housing 208 is formed. The circulating air module described above 116 as well as the air circulation realized thereby 118 preferably work as follows:
By means of the blower 120 a gas flow is driven and first the pressure chamber 190 fed.

About feed openings 196 , which may optionally be provided with valves, the gas flow in the treatment space section 114 initiated.

In this treatment room section 114 is preferably at least one workpiece 102 arranged, which receives by flowing around the same with the gas stream heat from the gas stream and is heated thereby. In particular, the workpiece becomes 102 dried by this.

Via one or more return openings 198 and a return line 192 this will be through the treatment room section 114 passed gas discharged and a suction 194 fed. For this intake 194 Finally, the gas therein is again through the one or more fans 120 sucked, leaving a circuit for through the treatment room section 114 Guided gas is formed.

In operation of the treatment plant 100 The recirculated gas cools down, in particular due to the heat transfer to the workpieces 102 ,

Thus, heat must be supplied continuously or regularly.

This is done by the supply of relative to that in the circulating air 118 Guided gas flow of heated fuel gas from a heating system 126 ,

This heating gas is supplied via the main supply line 156 provided and, if necessary, via the feed 206 branched off and the suction chamber 194 fed. In particular, the heating gas through the connection of the feed channel 206 to the suction chamber 194 by means of the one or more fans 120 if necessary, from the main supply 156 sucked.

Preferably at the same time via the discharge openings 200 which in particular by valves, for example, one or more exhaust valves 124 are formed, a part of the circulating air guide 118 Guided gas flow from the recirculation 118 dissipated. In particular, this can result in a total volume flow in the circulating air duct 118 guided gas flow are kept constant despite the supply of heating gas.

The discharged gas is delivered via the main discharge pipe 158 dissipated.

Preferably, a treatment plant comprises 100 , for example, according to one of 1 to 3 or 11 , several of the in the 4 to 10 shown circulating air modules 116 and / or treatment room sections 114 , The recirculation modules 116 and / or treatment room sections 114 are preferably perpendicular to the conveying direction 110 with the in the respective air circulation 118 flowed through the gas stream. A cross flow between two or more circulating air modules 116 and / or recirculating air ducts 118 is preferably minimal.

Preferably, a transverse flow with a component results parallel to the conveying direction 110 only because of the treatment room 112 supplied fresh gas and / or due to the discharge of exhaust gas from the treatment room 112 (see in particular the 1 and 2 ).

The described embodiments of the treatment plant 100 and / or the recirculation module 116 and / or recirculation 118 and / or the treatment room sections 114 are particularly suitable for use in a so-called transverse driving, in which the workpieces 102 , in particular the vehicle bodies 106 , transverse, in particular perpendicular, to the conveying direction 110 through the treatment room 112 be encouraged. In particular, a vehicle longitudinal axis is horizontal and substantially perpendicular to the conveying direction 110 aligned.

However, the described embodiments can also in a so-called longitudinal promotion of the workpieces 102 Use find, in which the vehicle longitudinal direction parallel to the conveying direction 110 is aligned.

An in 11 illustrated fourth embodiment of a treatment plant 100 is different from the one in 1 illustrated first embodiment essentially in that the treatment plant 100 a main treatment plant 220 and a pretreatment facility 222 includes.

The main treatment plant 220 is for example a main dryer 224 , The pretreatment plant 222 is for example a pre-dryer 226 ,

Preferably, the main treatment plant 220 essentially identical to the one with regard to 1 described first embodiment of a treatment plant 100 educated.

The pretreatment plant 222 is thus an optional additive for a treatment plant 100 according to one of the described embodiments, in particular the first embodiment.

The pretreatment plant 222 is preferably also essentially a treatment plant 100 according to one of the described embodiments, in particular according to the first embodiment.

It may be favorable if the pretreatment plant 222 smaller dimensioned than the main treatment plant 220 , For example, it can be provided that the pretreatment plant 222 a smaller treatment room 112 and / or preferably fewer treatment room sections 114 includes as the main treatment plant 220 ,

For example, it can be provided that a pretreatment plant 222 only three or four treatment room sections 114 includes.

The pretreatment plant 222 preferably includes one of the Heizgasführung 136 the main treatment plant 220 different and / or independent Heizgasführung 136 ,

Preferably, the recirculation modules 116 and / or treatment room sections 114 the pretreatment plant 222 independent of the heating gas guide 136 the main treatment plant 220 Heating gas can be supplied.

The heating gas guide 136 the pretreatment plant 222 is preferably by means of a separate heat exchanger 134 thermally with the exhaust gas discharge 132 the heater 128 coupled.

The heat exchanger 134 for thermal coupling of the pretreatment plant 222 with the exhaust gas discharge 132 the heater 128 can with respect to the flow direction of the exhaust gas of the heater 128 in the exhaust gas discharge 132 upstream or downstream of the heat exchanger 134 for the thermal coupling of the main treatment plant 220 with the exhaust gas discharge 132 the heater 128 be arranged. Preferably, the heat exchanger 134 the pretreatment plant 222 downstream of the heat exchanger 134 the main treatment plant 220 arranged.

The heat exchanger 134 for coupling the fresh gas supply 160 with the exhaust gas discharge 132 the heater 128 is preferably downstream of the heat exchanger 134 the main treatment plant 220 and / or downstream of the heat exchanger 134 the pretreatment plant 222 arranged. As a result, due to the usually low fresh gas temperature (fresh air temperature), the use of the exhaust gas in the heater 128 existing heat to be optimized.

Preferably, the entire treatment plant comprises 100 a single heater 128 , by means of which the heat for both the Heizgasführung 136 the main treatment plant 220 as well as for the heating gas guidance 136 the pretreatment plant 222 can be provided.

The treatment plant 100 can be a common fresh gas supply 160 for supplying fresh gas to both the treatment room 112 the main treatment plant 220 as well as the treatment room 112 the pretreatment plant 222 include.

Alternatively, however, it can also be provided that the treatment plant 100 two fresh gas feeds 160 comprising, wherein a fresh gas supply 160 the main treatment plant 220 and another fresh gas supply 160 the pretreatment plant 222 is assigned (not shown in the figures).

An exhaust gas from the pretreatment plant 222 is preferably by means of an exhaust discharge 172 the pretreatment plant 222 to the exhaust outlet 172 the main treatment plant 220 fed.

The exhaust gas from the pretreatment plant 222 is thus preferably together with the exhaust gas from the main treatment plant 220 to the common heater 128 fed.

The workpieces to be treated 102 are preferably by means of a conveyor 108 , in particular a single conveying device 108 , first through the treatment room 112 the pretreatment plant 222 and then through the treatment room 112 the main treatment plant 220 hindurchförderbar.

In 11 are the pretreatment plant 222 and the main treatment plant 220 spaced apart from each other. This is preferably only to illustrate the operation. However, it can also be provided that the pretreatment plant 222 and the main treatment plant 220 are arranged directly successively. By way of example, a lock designed as an intermediate lock can cover the otherwise directly adjacent treatment rooms 112 fluidically separate from each other. This intermediate lock then also forms an outlet lock 170 the pretreatment plant 222 and an inlet lock 168 the main treatment plant 220 ,

Because of the pretreatment plant 222 in addition to the main treatment plant 220 is provided and a separate Heizgasführung 136 includes, in particular at heavy evaporation of the workpieces to be treated 102 or otherwise heavily contaminated by the treatment room sections 114 guided gas flows a simple and efficient subdivision of the total to the treatment plant 100 belonging treatment room 112 will be realized.

Incidentally, the treatment plant is right 100 , in particular both the main treatment plant 220 as well as the pretreatment plant 222 , taken separately, in terms of structure and function with in 1 illustrated first embodiment, so that reference is made to the above description in this respect.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 1998129 B1 [0002]
• US 2006/0068094 A1 [0002]
• EP 1302737 A2 [0002]
• WO 02/073109 A1 [0002]

Claims (19)

Treatment plant ( 100 ) for treating workpieces, comprising: - a treatment room comprising a plurality of treatment room sections, each one of a plurality of separate air circulation modules ( 116 ) of the treatment plant ( 100 ) assigned; - a heating system ( 126 ), which a self-contained Heizgasführung ( 136 ), wherein several recirculation modules ( 116 ) with the heating gas guide ( 136 ) are coupled, in particular for heating the through the treatment space sections ( 114 ) guided gas. Treatment plant ( 100 ) according to claim 1, characterized in that the heating system ( 126 ) a heating device ( 128 ) and a heat exchanger ( 134 ) by means of which in the heating device ( 128 ) generated heat to a in the Heizgasführung ( 136 ) Guided heating gas is transferable. Treatment plant ( 100 ) according to one of claims 1 or 2, characterized in that the Heizgasführung ( 136 ) a central heating gas line ( 138 ), in which heating gas is guided or can be guided and by means of which the plurality of circulating air modules ( 116 ) and / or the treatment room sections ( 114 ) Heating gas from the heating gas duct ( 136 ) can be fed, wherein the heating gas in the respective treatment room sections ( 114 ) can be introduced. Treatment plant ( 100 ) according to one of claims 1 to 3, characterized in that the Heizgasführung ( 136 ) a central heating gas line ( 138 ), in which heating gas is guided or can be guided and by means of which gas from the circulating air modules ( 116 ) and / or from the treatment room sections ( 114 ) is dissipatable. Treatment plant ( 100 ) according to one of claims 1 to 4, characterized in that the Heizgasführung ( 136 ) a central heating gas line ( 138 ), by means of which a heating gas is annularly from a heat exchanger ( 134 ) for heating the heating gas to the plurality of air circulation modules ( 116 ) and / or treatment room sections ( 114 ) and back to the heat exchanger ( 134 ) is feasible. Treatment plant ( 100 ) according to one of claims 1 to 5, characterized in that the treatment plant ( 100 ) one of the heating system ( 126 ) different and / or independent fresh gas supply ( 160 ) by means of which fresh gas to the treatment room ( 112 ) can be fed. Treatment plant ( 100 ) according to one of claims 1 to 6, characterized in that the treatment plant ( 100 ) a fresh gas feed ( 160 ), by means of which fresh gas to a in the Heizgasführung ( 136 ) guided heating gas flow can be supplied. Treatment plant ( 100 ) according to one of claims 1 to 7, characterized in that the Heizgasführung ( 136 ) several branches ( 146 ) or branches ( 144 ) for distributing a in the Heizgasführung ( 136 ) guided Heizgasstroms on the recirculation modules ( 116 ) and / or treatment room sections ( 114 ). Treatment plant ( 100 ) according to one of claims 1 to 8, characterized in that the Heizgasführung ( 136 ) a main branch ( 180 ), by means of which a total amount of heating gas can be divided into a first partial stream of heating gas and a second partial stream of heating gas, the first partial stream of heating gas having a relative to a conveying direction ( 110 ) a conveying device ( 108 ) of the treatment plant ( 100 ) first recirculation module ( 116 ) or first to nth recirculation modules ( 116 ) and / or first treatment room section ( 114 ) or first to nth treatment room sections ( 114 ) can be fed and wherein the second partial heating gas flow to all other air circulation modules ( 116 ) and / or treatment room sections ( 114 ) is divisible. Treatment plant ( 100 ) according to one of claims 1 to 9, characterized in that the Heizgasführung ( 136 ) several merges to bring together several from the recirculation modules ( 116 ) and / or treatment room sections ( 114 ) comprises discharged gas streams. Treatment plant ( 100 ) according to one of claims 1 to 10, characterized in that the Heizgasführung ( 136 ) a main reunification ( 182 ), by means of which an exhaust gas flow with respect to a conveying direction ( 110 ) a conveying device ( 108 ) of the treatment plant ( 100 ) first recirculation module ( 116 ) or first to nth recirculation modules ( 116 ) and / or first treatment room section ( 114 ) or first to nth treatment room sections ( 114 ) with an already combined exhaust gas flow of all other air circulation modules ( 116 ) and / or treatment room sections ( 114 ) is merge. Treatment plant ( 100 ) according to one of claims 1 to 11, characterized in that each circulating air module ( 116 ) and / or each treatment room section ( 114 ) an inlet valve ( 122 ) and / or an outlet valve ( 124 ), by means of which a volume flow of the circulating air module ( 116 ) and / or the treatment room section ( 114 ) to be supplied Heizgasstroms and / or a volume flow of a from the circulating air module ( 116 ) and / or the treatment room section ( 114 ) discharged gas stream is controllable and / or regulated. Treatment plant ( 100 ) according to one of claims 1 to 12, characterized in that the treatment plant ( 100 ) a control device ( 154 ) by means of which an at least approximately constant volume flow of the in the Heizgasführung ( 136 ) guided Heizgasstroms is maintained, in particular by controlling a heating gas stream driving the fan ( 120 ) of the heating gas guide ( 136 ). Treatment plant ( 100 ) according to one of claims 1 to 13, characterized in that the treatment plant ( 100 ) a control device ( 154 ) by means of which an at least approximately constant temperature of the in the Heizgasführung ( 136 ) guided Heizgasstroms is maintained, in particular by influencing a on a heat exchanger ( 134 ) for heating the Heizgasstroms bypassing bypass flow. Treatment plant ( 100 ) according to one of claims 1 to 14, characterized in that the Heizgasführung ( 136 ) a bypass line ( 150 ) for bypassing all air circulation modules ( 116 ) and / or treatment room sections ( 114 ). Treatment plant ( 100 ) according to one of claims 1 to 15, characterized in that the circulating air modules ( 116 ) at least one blower ( 120 ) and immediately upstream of the at least one blower ( 120 ) arranged suction space ( 194 ), wherein in the suction space ( 194 ) preferably a feed channel ( 206 ), via which heating gas from a Heizgasleitung ( 138 ) of the heating gas guide ( 136 ) to the circulating air module ( 116 ) can be fed. Treatment plant ( 100 ) according to one of claims 1 to 16, characterized in that a main discharge line ( 158 ) for the removal of air from the recirculation modules ( 116 ) and / or the treatment room sections ( 114 ) discharged gas streams within a treatment room ( 112 ) forming or surrounding housing ( 208 ) is arranged. Process for treating workpieces ( 102 ), comprising: - flowing through a plurality of treatment room sections ( 114 ) of a treatment room ( 112 ) of a treatment plant ( 100 ) with several gas streams conducted in separate circuits; Heating of the gas streams by means of a stream of heating gas, which is carried out in a self-contained heating gas duct ( 136 ) a heating system ( 126 ) of the treatment plant ( 100 ) is guided. A method according to claim 18, characterized in that for the purpose of heating the plurality of gas streams guided in the separate circuits, a partial stream of each of these gas streams is removed from the respective gas stream and replaced by a partial stream of the heating gas stream.

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